"The four questions which the author has most frequently heard in discussing world problems with men are the following: "What progress is the missionary enterprise making? How much remains to be done? What is America's share of world responsibility? How can men relate themselves in a practical way to the spread of Christianity throughout the world?" It is to give a brief answer to these four fundamental questions that "The Call of the World" has been written for use in Missionary Discussion Groups, Men's Bible Classes, Brotherhoods, Missionary Committees, and groups of Sunday School Officers and Teachers. It is also confidently expected that many men who cannot meet to discuss these problems in any of the groups mentioned will read and study the book in private. In preparing the manuscript the author has had in mind a large number of men who are now or should become public advocates of missions. The book presents information which they may use in addresses.